From tecmath: Percentages can be done mentally both accurately and rapidly using this cool math trick. Become a genius in no time! Credit: https://www.youtube.com/watch?v=YWHx0RsRNzI&list=RDYWHx0RsRNzI&start_radio=1
From tecmath: Percentages can be done mentally both accurately and rapidly using this cool math trick. Become a genius in no time! Credit: https://www.youtube.com/watch?v=YWHx0RsRNzI&list=RDYWHx0RsRNzI&start_radio=1
